Grain sieve



A. EVENSON lMay 14, 1940,

GRAIN SIEVE Filed May 2, 1939 2 Sheets-Sheet 1 lnvenor ANDREW EvENsoN,

Ar EVENSON May 14, 1940.

GRAIN SIEVE Filed May 2, 1939 2 Sheets-Sheet 2 Inventor 1E ANDREW EVENSON,

@Mm and um Aforneys Patented May 14, 1940 UNITED STATES GRAIN .SIEVE Andrew Evenson,

Canby, Minn-1 assigner of thirty per cent to Sam K. Nomeland, Porter,

Minn.

Application May 2, 1939, Serial No. 271,334

2 Claims.

This invention appertains to new and useful improvements especially adapted for use on grain threshing machines, grain fanning mills and other grain grading apparatus.

The principal object of the present invention is to provide a sieve whereinthe parts are adinstable.

Another important object of the invention is to provide a sieve which is contemplated to save grain, in that it is possible to adjust the wind treatment with more precision and results in eicient grain separation.

These and other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings:

Figure l represents a top plan View.

Figure 2 is a section on line 2-2 of Figure l.

Figure 3 is a fragmentary bottom plan view.

Figure 4 is a fragmentary detailed sectional view on line 4--4 of Figure 1.

Figure 5 is a fragmentary top plan View of a modified form of sieve.

Figure 6 is a section on line 6--6 of Figure 5.

Referring to the drawings wherein like numerals designate like parts, it can be seen that the drawings disclose the sieve as it is to be attached to the grain shoe of the thresher. The sieve consists of the two side members 5-5 each 30 of which has an inwardly disposed shoulder 6 having the stepped ledges 1 and 8 for supporting the slidable frame 9 and supporting the stationary frame I0, respectively.

The stationary frame consists of a plate II having the plurality of parallel longitudinally extending slots I2 therein through which dip the wind guides or deflectors I3 which incline from the cross members I4 of the slide frame 9. These wind guides I3 are struck downwardly, defining 40 the longitudinal slots I 5 in the frame 9 and struck upwardly and further formed to provide the ser'- rations I5. These struck up teeth I5 are disposed in inclined relation as shown in Figure 2 and overlap the downwardly disposed wind guides I3. As a matter of fact the teeth I5 are disposed in substantial parallel spaced relation with respect to the underlying wind guides I3.

Slide bars I'I-I'I slidably disposed through guides I9 on the bottom of the frame I I), are suitably secured as by welding or the like to the lower edges of the wind guides I3 and each hasthe curved end portion of a link rod 2l pivotally secured thereto as at 22. The remaining end of the corresponding link rod 2I is pivotally secured as at 23 to one end of the bell crank 24 which is fulcrumed as at 25 on the bottom of the frame I0. The control rod 25 connects to the re maining end of the bell crank 24 and a connecting rod 2l' connects the intermediate portions of the outstanding legs of the bell crank 24 as clear-l ly shown in Figure 1.

Obviously whenever desired, the frame 9 can be slid so as to open or close the openings I2 to the desired extent and properly place the wind guides I3 with respect to these slots I2.

As is clearly shown in Figure 4 the teeth or serrations l5 are in offset relation with respect to each other so that kernels which may pass through certain of the rows of teeth will hit against the teeth on one oranother of the other' rows of teeth and eventually fall through the sieve before passing thereover.

A slightly modified form of the invention is shown in Figure 6 wherein instead of having the upper slidable frame 9a equipped with the teeth I5, the cross members Ma of the frame 9a have wire or rod members 28 secured thereto and extending longitudinally thereof adjacent the corresponding slot I5a. These wires or rods 28 are soldered or otherwise secured to the frame 9a. This type of sieve is especially adapted for use in farming mills and not on threshing machines.

While the foregoing specification sets forth the invention in specic terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter. l

Having described the invention what is claimed as new is:

1. A sieve comprising a stationary frame including a bottom provided therein with parallel laterally spaced slots extending from side to side thereof, and a plate-like member in said frame slidable therein over said bottom and being pro vided with slots therein similar to the first-mentioned slots and registerable with the latter under sliding of the member, flanges on said mem-y ber' extending along the slots thereof, respectively, on one side of said slots and from end to end thereof and inclining downwardly through the slots of said frame to provide oblique depending wind guides, and raised elements on said member extending along the slots thereof, respectively, from end to end of said slots and on the other side thereof and providing upstanding wind guides, said elements comprising saw toothed flanges on said member, respectively, inclined in correspondence with the first-mentioned flanges.

of said frame to provide oblique depending wind guides, and raised elements on said member extending along the slots thereof, respectively, from end to end of said slots and the other side thereof and providing upstanding wind guides, said elements comprising saw toothed flanges on said member, respectively, inclined in correspondence With the first-mentioned flanges, and means for sliding said member.

ANDREW EVENSON. 

